source: trunk/essentials/dev-lang/python/Mac/Modules/dlg/dlgsupport.py

# This script generates the Dialogs interface for Python.
# It uses the "bgen" package to generate C code.
# It execs the file dlggen.py which contain the function definitions
# (dlggen.py was generated by dlgscan.py, scanning the <Dialogs.h> header file).

from macsupport import *

# Create the type objects

DialogPtr = OpaqueByValueType("DialogPtr", "DlgObj")
DialogRef = DialogPtr

# An OptHandle is either a handle or None (in case NULL is passed in).
# This is needed for GetDialogItem().
OptHandle = OpaqueByValueType("Handle", "OptResObj")

ModalFilterProcPtr = InputOnlyType("PyObject*", "O")
ModalFilterProcPtr.passInput = lambda name: "Dlg_PassFilterProc(%s)" % name
ModalFilterUPP = ModalFilterProcPtr

RgnHandle = OpaqueByValueType("RgnHandle", "ResObj")
TEHandle = OpaqueByValueType("TEHandle", "ResObj")
CGrafPtr = OpaqueByValueType("CGrafPtr", "GrafObj")

DITLMethod = Type("DITLMethod", "h")
DialogItemIndex = Type("DialogItemIndex", "h")
DialogItemType = Type("DialogItemType", "h")
DialogItemIndexZeroBased = Type("DialogItemIndexZeroBased", "h")
AlertType = Type("AlertType", "h")
StringPtr = Str255
EventMask = Type("EventMask", "H")

includestuff = includestuff + """
#include <Carbon/Carbon.h>

#ifdef USE_TOOLBOX_OBJECT_GLUE
extern PyObject *_DlgObj_New(DialogRef);
extern PyObject *_DlgObj_WhichDialog(DialogRef);
extern int _DlgObj_Convert(PyObject *, DialogRef *);

#define DlgObj_New _DlgObj_New
#define DlgObj_WhichDialog _DlgObj_WhichDialog
#define DlgObj_Convert _DlgObj_Convert
#endif

/* XXX Shouldn't this be a stack? */
static PyObject *Dlg_FilterProc_callback = NULL;

static pascal Boolean Dlg_UnivFilterProc(DialogPtr dialog,
                                         EventRecord *event,
                                         short *itemHit)
{
        Boolean rv;
        PyObject *args, *res;
        PyObject *callback = Dlg_FilterProc_callback;
        if (callback == NULL)
                return 0; /* Default behavior */
        Dlg_FilterProc_callback = NULL; /* We'll restore it when call successful */
        args = Py_BuildValue("O&O&", DlgObj_WhichDialog, dialog, PyMac_BuildEventRecord, event);
        if (args == NULL)
                res = NULL;
        else {
                res = PyEval_CallObject(callback, args);
                Py_DECREF(args);
        }
        if (res == NULL) {
                PySys_WriteStderr("Exception in Dialog Filter\\n");
                PyErr_Print();
                *itemHit = -1; /* Fake return item */
                return 1; /* We handled it */
        }
        else {
                Dlg_FilterProc_callback = callback;
                if (PyInt_Check(res)) {
                        *itemHit = PyInt_AsLong(res);
                        rv = 1;
                }
                else
                        rv = PyObject_IsTrue(res);
        }
        Py_DECREF(res);
        return rv;
}

static ModalFilterUPP
Dlg_PassFilterProc(PyObject *callback)
{
        PyObject *tmp = Dlg_FilterProc_callback;
        static ModalFilterUPP UnivFilterUpp = NULL;

        Dlg_FilterProc_callback = NULL;
        if (callback == Py_None) {
                Py_XDECREF(tmp);
                return NULL;
        }
        Py_INCREF(callback);
        Dlg_FilterProc_callback = callback;
        Py_XDECREF(tmp);
        if ( UnivFilterUpp == NULL )
                UnivFilterUpp = NewModalFilterUPP(&Dlg_UnivFilterProc);
        return UnivFilterUpp;
}

static PyObject *Dlg_UserItemProc_callback = NULL;

static pascal void Dlg_UnivUserItemProc(DialogPtr dialog,
                                         short item)
{
        PyObject *args, *res;

        if (Dlg_UserItemProc_callback == NULL)
                return; /* Default behavior */
        Dlg_FilterProc_callback = NULL; /* We'll restore it when call successful */
        args = Py_BuildValue("O&h", DlgObj_WhichDialog, dialog, item);
        if (args == NULL)
                res = NULL;
        else {
                res = PyEval_CallObject(Dlg_UserItemProc_callback, args);
                Py_DECREF(args);
        }
        if (res == NULL) {
                PySys_WriteStderr("Exception in Dialog UserItem proc\\n");
                PyErr_Print();
        }
        Py_XDECREF(res);
        return;
}

#if 0
/*
** Treating DialogObjects as WindowObjects is (I think) illegal under Carbon.
** However, as they are still identical under MacOS9 Carbon this is a problem, even
** if we neatly call GetDialogWindow() at the right places: there's one refcon field
** and it points to the DialogObject, so WinObj_WhichWindow will smartly return the
** dialog object, and therefore we still don't have a WindowObject.
** I'll leave the chaining code in place for now, with this comment to warn the
** unsuspecting victims (i.e. me, probably, in a few weeks:-)
*/
extern PyMethodChain WinObj_chain;
#endif
"""

finalstuff = finalstuff + """
/* Return the WindowPtr corresponding to a DialogObject */
#if 0
WindowPtr
DlgObj_ConvertToWindow(PyObject *self)
{
        if ( DlgObj_Check(self) )
                return GetDialogWindow(((DialogObject *)self)->ob_itself);
        return NULL;
}
#endif
/* Return the object corresponding to the dialog, or None */

PyObject *
DlgObj_WhichDialog(DialogPtr d)
{
        PyObject *it;

        if (d == NULL) {
                it = Py_None;
                Py_INCREF(it);
        } else {
                WindowPtr w = GetDialogWindow(d);

                it = (PyObject *) GetWRefCon(w);
                if (it == NULL || ((DialogObject *)it)->ob_itself != d || !DlgObj_Check(it)) {
#if 0
                        /* Should do this, but we don't have an ob_freeit for dialogs yet. */
                        it = WinObj_New(w);
                        ((WindowObject *)it)->ob_freeit = NULL;
#else
                        it = Py_None;
                        Py_INCREF(it);
#endif
                } else {
                        Py_INCREF(it);
                }
        }
        return it;
}
"""

initstuff = initstuff + """
        PyMac_INIT_TOOLBOX_OBJECT_NEW(DialogPtr, DlgObj_New);
        PyMac_INIT_TOOLBOX_OBJECT_NEW(DialogPtr, DlgObj_WhichDialog);
        PyMac_INIT_TOOLBOX_OBJECT_CONVERT(DialogPtr, DlgObj_Convert);
"""


# Define a class which specializes our object definition
class MyObjectDefinition(PEP253Mixin, GlobalObjectDefinition):
    def __init__(self, name, prefix = None, itselftype = None):
        GlobalObjectDefinition.__init__(self, name, prefix, itselftype)
## This won't work in Carbon, so we disable it for all MacPythons:-(
## But see the comment above:-((
##              self.basechain = "&WinObj_chain"

    def outputInitStructMembers(self):
        GlobalObjectDefinition.outputInitStructMembers(self)
        Output("SetWRefCon(GetDialogWindow(itself), (long)it);")

    def outputCheckNewArg(self):
        Output("if (itself == NULL) { Py_INCREF(Py_None); return Py_None; }")

    def outputCheckConvertArg(self):
        Output("if (v == Py_None) { *p_itself = NULL; return 1; }")
        Output("if (PyInt_Check(v)) { *p_itself = (DialogPtr)PyInt_AsLong(v);")
        Output("                      return 1; }")

    def outputCompare(self):
        Output()
        Output("static int %s_compare(%s *self, %s *other)", self.prefix, self.objecttype, self.objecttype)
        OutLbrace()
        Output("if ( self->ob_itself > other->ob_itself ) return 1;")
        Output("if ( self->ob_itself < other->ob_itself ) return -1;")
        Output("return 0;")
        OutRbrace()

    def outputHash(self):
        Output()
        Output("static int %s_hash(%s *self)", self.prefix, self.objecttype)
        OutLbrace()
        Output("return (int)self->ob_itself;")
        OutRbrace()

    def outputFreeIt(self, itselfname):
        Output("DisposeDialog(%s);", itselfname)

# Create the generator groups and link them
module = MacModule('_Dlg', 'Dlg', includestuff, finalstuff, initstuff)
object = MyObjectDefinition('Dialog', 'DlgObj', 'DialogPtr')
module.addobject(object)

# Create the generator classes used to populate the lists
Function = OSErrWeakLinkFunctionGenerator
Method = OSErrWeakLinkMethodGenerator

# Create and populate the lists
functions = []
methods = []
execfile("dlggen.py")

# add the populated lists to the generator groups
for f in functions: module.add(f)
for f in methods: object.add(f)

setuseritembody = """
        PyObject *new = NULL;


        if (!PyArg_ParseTuple(_args, "|O", &new))
                return NULL;

        if (Dlg_UserItemProc_callback && new && new != Py_None) {
                PyErr_SetString(Dlg_Error, "Another UserItemProc is already installed");
                return NULL;
        }

        if (new == NULL || new == Py_None) {
                new = NULL;
                _res = Py_None;
                Py_INCREF(Py_None);
        } else {
                Py_INCREF(new);
                _res = Py_BuildValue("O&", ResObj_New, (Handle)NewUserItemUPP(Dlg_UnivUserItemProc));
        }

        Dlg_UserItemProc_callback = new;
        return _res;
"""
f = ManualGenerator("SetUserItemHandler", setuseritembody)
module.add(f)

# generate output
SetOutputFileName('_Dlgmodule.c')
module.generate()